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package files
import (
"context"
"encoding/json"
badger "github.com/dgraph-io/badger/v4"
progressbar "github.com/schollz/progressbar/v3"
"golang.org/x/sync/errgroup"
)
func decodeDbInfo(item *badger.Item) (*FileInfo, error) {
var info FileInfo
if err := item.Value(func(val []byte) error {
if err := json.Unmarshal(val, &info); err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return &info, nil
}
func getInfoFromDb(database *badger.DB, hashsum []byte) (*FileInfo, error) {
var info *FileInfo
if err := database.View(func(txn *badger.Txn) error {
item, err := txn.Get(hashsum)
if err != nil {
return err
}
info, err = decodeDbInfo(item)
if err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return info, nil
}
func (filedata *FileInfo) evaluateFile(database *badger.DB, hashsum []byte, encoder string) error {
info, err := getInfoFromDb(database, hashsum)
if err != nil {
return err
}
if info.Process {
return ReencodeNeeded
}
if filedata.Encoder != encoder {
return ReencodeNeeded
}
if info.AbsPath != filedata.AbsPath {
return FileMoved
}
return ReencodeNotNeeded
}
func (filedata *FileInfo) updateFile(wb *badger.WriteBatch, hashsum []byte) error {
encoded, err := json.Marshal(filedata)
if err != nil {
return err
}
return wb.Set(hashsum, encoded)
}
func (filedata *FileInfo) IndexFile(ctx context.Context, hashsum []byte) error {
database := ctx.Value("database").(*badger.DB)
encoder := ctx.Value("encoder").(string)
counter := ctx.Value("counter").(*int64)
err := filedata.evaluateFile(database, hashsum, encoder)
switch err {
case FileMoved, ReencodeNotNeeded:
filedata.Process = false
case ReencodeNeeded, badger.ErrKeyNotFound:
*counter += 1
default:
return err
}
wb := database.NewWriteBatch()
defer wb.Cancel()
if err := filedata.updateFile(wb, hashsum); err != nil {
return err
}
if err := wb.Flush(); err != nil {
return err
}
return nil
}
func ReencodeFlacs(ctx context.Context) error {
db := ctx.Value("database").(*badger.DB)
bar := progressbar.NewOptions64(
*ctx.Value("counter").(*int64),
progressbar.OptionSetDescription("Reencoding..."),
progressbar.OptionShowCount(),
)
defer bar.Close()
wb := db.NewWriteBatch()
defer wb.Cancel()
wg := new(errgroup.Group)
wg.SetLimit(4)
err := db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 10
it := txn.NewIterator(opts)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
select {
case <-ctx.Done():
return nil
default:
item := it.Item()
key := item.Key()
info, err := decodeDbInfo(item)
if err != nil {
return err
}
if info.Process {
wg.Go(func() error {
select {
case <-ctx.Done():
return nil
default:
if err := info.reencodeFile(ctx); err != nil {
return err
}
if err := info.updateFile(wb, key); err != nil {
return err
}
bar.Add64(1)
return nil
}
})
}
}
}
return nil
})
wg.Wait()
return err
}
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